Oh, yes. Harmless is just the word. That's why I like it! Doesn't kill, doesn't wound, doesn't maim. But I'll tell you what it does do. It is very good at opening doors. [The Doctor activates the screwdriver and the doors explode inwards; Jake's squad and some Cybermen enter and open fire.]
Inside the TARDIS. There's one tiny little gap in the universe left, just about to close. And it takes a lot of power to send this projection; I'm in orbit around a supernova. I'm burning up a sun, just to say goodbye.
Rose Tyler. Defender of the Earth. You're dead, officially, back home. So many people died that day, and you've gone missing. You're on a list of the dead. Here you are, living a life day after day. The one adventure I can never have.
That's what made it easy. It's like you said, Doctor. The big picture. What's the point of it all if the human race is nothing? That's what the Empress can give me. The chance to... to go out there to see it, the size of it all. I think you understand that, don't you, Doctor?
[bewildered upon entering the TARDIS] How does it do that? It's wood! It's like a box with that room just crammed in. It's... [The Doctor mouths the next few words along with her] bigger on the inside!
DThe Doctor
[sarcastically] Is it?!?! I hadn't noticed! [The Doctor Throws His Trenchcoat On a Coral] Right then, Let's get going!